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When communicating to the Web service, SOAP messages must be constructed and sent to the Web service. The resulting SOAP message then must be parsed before it can be consumed by the application. This can be a very time-consuming task. The job of a proxy class is to encapsulate this code into a class that exposes the Web service data types and methods, but performs the assembly and disassembly of the SOAP messages transparently. Proxies are entities that act on behalf of other entities. With Web services, proxies expose the same logical interface to a Web service consumer as a Web service itself exposes. Thus, Visual Studio .NET developers are still able to use strongly typed classes, and IntelliSense operates as though the Web service were a local class. Visual Studio .NET can create a Web service proxy by assigning a reference to the WSDL document of the desired Web service. A tool called WSDL.exe can be used to create the Web service proxy. The WSDL.exe utility is used to generate a proxy class that can be included in a Visual Studio .NET project. When using Visual Studio .NET, this tool is rarely required, since adding a Web reference to a project automatically generates the proxy class. However, there are times when this tool must be used, such as when a name and password are required to access a firewall. In this situation, the Visual Studio .NET graphical tools break, but the WSDL tool has options for using a firewall (or proxy) username and password.

The regression model for the oxygen purity data in Example 11-1 is y 74.283 14.947x. Table 11-4 presents the observed and predicted values of y at each value of x from this data set, along with the corresponding residual. These values were computed using Minitab and show

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Table 11-4 Oxygen Purity Data from Example 11-1, Predicted Values, and Residuals Hydrocarbon Level, x 1 2 3 4 5 6 7 8 9 10 0.99 1.02 1.15 1.29 1.46 1.36 0.87 1.23 1.55 1.40 Oxygen Purity, y 90.01 89.05 91.43 93.74 96.73 94.45 87.59 91.77 99.42 93.65 Predicted Value, y 89.069009 89.518136 91.464353 93.560279 96.105332 94.608242 87.272501 92.662025 97.452713 95.207078 Residual e y y 0.940991 0.468136 0.034353 0.179721 0.624668 0.158242 0.317499 0.892025 1.967287 1.557078 11 12 13 14 15 16 17 18 19 20 Hydrocarbon Level, x 1.19 1.15 0.98 1.01 1.11 1.20 1.26 1.32 1.43 0.95 Oxygen Purity, y 93.54 92.52 90.56 89.54 89.85 90.39 93.25 93.41 94.98 87.33 Predicted Value, y 92.063189 91.614062 88.919300 89.368427 90.865517 92.212898 93.111152 94.009406 95.656205 88.470173 Residual y e y 1.476811 0.905938 1.640700 0.171573 1.015517 1.822898 0.138848 0.599406 0.676205 1.140173

16

the number of decimal places typical of computer output. A normal probability plot of the residuals is shown in Fig. 11-10. Since the residuals fall approximately along a straight line in the gure, we conclude that there is no severe departure from normality. The residuals are also plotted against the predicted value yi in Fig. 11-11 and against the hydrocarbon levels xi in Fig. 11-12. These plots do not indicate any serious model inadequacies.

11-8.2

Coef cient of Determination(R2)

The WSDL.exe utility can be executed from the Visual Studio .NET command prompt. It is possible to retrieve the WSDL document from a Web service and create a proxy class using WSDL /L:VB http://localhost/hiworld/ hi.asmx WSDL. The default language that WSDL uses is C#, but the language can be selected with the /L switch. Use the / switch to get a list of available options.

The quantity R2 SSR SST 1 SSE SST (11-34)

is called the coef cient of determination and is often used to judge the adequacy of a regression model. Subsequently, we will see that in the case where X and Y are jointly distributed random variables, R2 is the square of the correlation coef cient between X and Y. From

For each method exposed by the Web service, synchronous and asynchronous methods are created. The synchronous methods use the standard class name. To execute a method asynchronously, use the methods having Begin and End prefixes.

99.9 99 Cumulative normal probability 95 80 50 20 5 1 0.1 1.9 0.9 0.1 Residuals 1.1 2.1 Residuals 2.5 2 1.5 1 0.5 0 0.5 1 1.5 2 2.5 87

Constructing Arguments Arguments are enclosed in parentheses. When applying a function to individual cells in a worksheet, you can use a comma to separate the cell addresses, as in =SUM(A5,B5,C5). When applying a function to a range of cells, you can use a colon to designate the first and last cells in the range, as in =SUM(B5:E12). If your range has a name, you can insert the name, as in =SUM(Sales).

Figure 11-10 Normal probability plot of residuals, Example 11-7.

When a developer drops a button control onto a Web page, she is using a control that was created by another party. A productive developer may use only components that have been produced by third parties, and she may never actually create a component herself. The same holds true for Web services. A developer may never create a Web service, but still can be very productive by using Web services that have been developed by third parties. Here, we examine the steps of locating a Web service that converts text to an image. The code to accomplish this is covered in 11, but this example uses a Web service to accomplish the same function.

Figure 11-11 Plot of residuals versus predicted oxygen purity y, Example 11-7.

0.9

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